curl/lib/Makefile.am

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#***************************************************************************
# _ _ ____ _
# Project ___| | | | _ \| |
# / __| | | | |_) | |
# | (__| |_| | _ <| |___
# \___|\___/|_| \_\_____|
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#
# Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
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# are also available at https://curl.se/docs/copyright.html.
#
# You may opt to use, copy, modify, merge, publish, distribute and/or sell
# copies of the Software, and permit persons to whom the Software is
# furnished to do so, under the terms of the COPYING file.
#
# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
# KIND, either express or implied.
#
# SPDX-License-Identifier: curl
#
###########################################################################
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AUTOMAKE_OPTIONS = foreign nostdinc
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CMAKE_DIST = CMakeLists.txt curl_config.h.cmake
EXTRA_DIST = Makefile.mk config-win32.h config-win32ce.h config-plan9.h \
config-riscos.h config-mac.h curl_config.h.in config-dos.h libcurl.rc \
config-amigaos.h config-win32ce.h config-os400.h setup-os400.h \
$(CMAKE_DIST) setup-win32.h .checksrc Makefile.soname
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lib_LTLIBRARIES = libcurl.la
if BUILD_UNITTESTS
noinst_LTLIBRARIES = libcurlu.la
else
noinst_LTLIBRARIES =
endif
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# This might hold -Werror
CFLAGS += @CURL_CFLAG_EXTRAS@
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# Specify our include paths here, and do it relative to $(top_srcdir) and
# $(top_builddir), to ensure that these paths which belong to the library
# being currently built and tested are searched before the library which
# might possibly already be installed in the system.
#
# $(top_srcdir)/include is for libcurl's external include files
# $(top_builddir)/lib is for libcurl's generated lib/curl_config.h file
build: fix circular header inclusion with other packages This commit renames lib/setup.h to lib/curl_setup.h and renames lib/setup_once.h to lib/curl_setup_once.h. Removes the need and usage of a header inclusion guard foreign to libcurl. [1] Removes the need and presence of an alarming notice we carried in old setup_once.h [2] ---------------------------------------- 1 - lib/setup_once.h used __SETUP_ONCE_H macro as header inclusion guard up to commit ec691ca3 which changed this to HEADER_CURL_SETUP_ONCE_H, this single inclusion guard is enough to ensure that inclusion of lib/setup_once.h done from lib/setup.h is only done once. Additionally lib/setup.h has always used __SETUP_ONCE_H macro to protect inclusion of setup_once.h even after commit ec691ca3, this was to avoid a circular header inclusion triggered when building a c-ares enabled version with c-ares sources available which also has a setup_once.h header. Commit ec691ca3 exposes the real nature of __SETUP_ONCE_H usage in lib/setup.h, it is a header inclusion guard foreign to libcurl belonging to c-ares's setup_once.h The renaming this commit does, fixes the circular header inclusion, and as such removes the need and usage of a header inclusion guard foreign to libcurl. Macro __SETUP_ONCE_H no longer used in libcurl. 2 - Due to the circular interdependency of old lib/setup_once.h and the c-ares setup_once.h header, old file lib/setup_once.h has carried back from 2006 up to now days an alarming and prominent notice about the need of keeping libcurl's and c-ares's setup_once.h in sync. Given that this commit fixes the circular interdependency, the need and presence of mentioned notice is removed. All mentioned interdependencies come back from now old days when the c-ares project lived inside a curl subdirectory. This commit removes last traces of such fact.
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# $(top_srcdir)/lib for libcurl's lib/curl_setup.h and other "private" files
AM_CPPFLAGS = -I$(top_srcdir)/include \
-I$(top_builddir)/lib \
-I$(top_srcdir)/lib
# Prevent LIBS from being used for all link targets
LIBS = $(BLANK_AT_MAKETIME)
include Makefile.soname
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AM_CPPFLAGS += -DBUILDING_LIBCURL
AM_LDFLAGS =
AM_CFLAGS =
# Makefile.inc provides the CSOURCES and HHEADERS defines
include Makefile.inc
libcurl_la_SOURCES = $(CSOURCES) $(HHEADERS)
libcurlu_la_SOURCES = $(CSOURCES) $(HHEADERS)
libcurl_la_CPPFLAGS_EXTRA =
libcurl_la_LDFLAGS_EXTRA =
libcurl_la_CFLAGS_EXTRA =
if CURL_LT_SHLIB_USE_VERSION_INFO
libcurl_la_LDFLAGS_EXTRA += $(VERSIONINFO)
endif
if CURL_LT_SHLIB_USE_NO_UNDEFINED
libcurl_la_LDFLAGS_EXTRA += -no-undefined
endif
if CURL_LT_SHLIB_USE_MIMPURE_TEXT
libcurl_la_LDFLAGS_EXTRA += -mimpure-text
endif
if CURL_LT_SHLIB_USE_VERSIONED_SYMBOLS
libcurl_la_LDFLAGS_EXTRA += -Wl,--version-script=libcurl.vers
else
# if symbol-hiding is enabled, hide them!
if DOING_CURL_SYMBOL_HIDING
libcurl_la_LDFLAGS_EXTRA += -export-symbols-regex '^curl_.*'
endif
endif
if USE_CPPFLAG_CURL_STATICLIB
libcurl_la_CPPFLAGS_EXTRA += -DCURL_STATICLIB
else
if HAVE_WINDRES
libcurl_la_SOURCES += $(LIB_RCFILES)
$(LIB_RCFILES): $(top_srcdir)/include/curl/curlver.h
endif
endif
if DOING_CURL_SYMBOL_HIDING
libcurl_la_CPPFLAGS_EXTRA += -DCURL_HIDDEN_SYMBOLS
libcurl_la_CFLAGS_EXTRA += $(CFLAG_CURL_SYMBOL_HIDING)
endif
libcurl_la_CPPFLAGS = $(AM_CPPFLAGS) $(libcurl_la_CPPFLAGS_EXTRA)
autotools: avoid passing `LDFLAGS` twice to libcurl autotools passes `LDFLAGS` automatically linker commands. curl's `lib/Makefile.am` customizes libcurl linker flags. In that customization, it added `LDFLAGS` to the custom flags. This resulted in passing `LDFLAGS` _twice_ to the `libtool` command. Most of the time this is benign, but some `LDFLAGS` options can break the build when passed twice. One such example is passing `.o` files, e.g. `crt*.o` files necessary when customizing the C runtime, e.g. for MUSL builds. Passing them twice resulted in duplicate symbol errors: ``` libtool: link: clang-15 --target=aarch64-unknown-linux-musl [...] /usr/lib/aarch64-linux-musl/crt1.o [...] /usr/lib/aarch64-linux-musl/crt1.o [...] ld.lld-15: error: duplicate symbol: _start >>> defined at crt1.c >>> /usr/lib/aarch64-linux-musl/crt1.o:(.text+0x0) >>> defined at crt1.c >>> /usr/lib/aarch64-linux-musl/crt1.o:(.text+0x0) [...] clang: error: linker command failed with exit code 1 (use -v to see invocation) ``` This behaviour came with commit 1a593191c2769a47b8c3e4d9715ec9f6dddf5e36 (2013-07-23) as a fix for bug https://curl.haxx.se/bug/view.cgi?id=1217. The patch was a works-for-me hack that ended up merged in curl: https://sourceforge.net/p/curl/bugs/1217/#06ef With the root cause remaining unclear. Perhaps the SUNPro 12 linker was sensitive to `-L` `-l` order, requiring `-L` first? This would be unusual and suggests a bug in either the linker or in `libtool`. The curl build does pass the list of detected libs via its own `LIBCURL_LIBS` variable, which ends up before `LDFLAGS` on the `libtool` command line, but it's the job of `libtool` to ensure that even a peculiar linker gets the options in the expected order. Also because autotools passes `LDFLAGS` last, making it hardly possible to pass anything after it. Perhaps in the 10 years since this issue, this already got a fix upstream. This patch deletes `LDFLAGS` from our customized libcurl options, leaving a single copy of them as passed by autotools automatically. Reverts 1a593191c2769a47b8c3e4d9715ec9f6dddf5e36 Closes #12310
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libcurl_la_LDFLAGS = $(AM_LDFLAGS) $(libcurl_la_LDFLAGS_EXTRA) $(CURL_LDFLAGS_LIB) $(LIBCURL_LIBS)
libcurl_la_CFLAGS = $(AM_CFLAGS) $(libcurl_la_CFLAGS_EXTRA)
libcurlu_la_CPPFLAGS = $(AM_CPPFLAGS) -DCURL_STATICLIB -DUNITTESTS
libcurlu_la_LDFLAGS = $(AM_LDFLAGS) -static $(LIBCURL_LIBS)
libcurlu_la_CFLAGS = $(AM_CFLAGS)
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CHECKSRC = $(CS_$(V))
CS_0 = @echo " RUN " $@;
CS_1 =
CS_ = $(CS_0)
checksrc:
$(CHECKSRC)(@PERL@ $(top_srcdir)/scripts/checksrc.pl -D$(srcdir) \
-W$(srcdir)/curl_config.h $(srcdir)/*.[ch] $(srcdir)/vauth/*.[ch] \
$(srcdir)/vtls/*.[ch] $(srcdir)/vquic/*.[ch] $(srcdir)/vssh/*.[ch])
if DEBUGBUILD
# for debug builds, we scan the sources on all regular make invokes
all-local: checksrc
endif
# disable the tests that are mostly causing false positives
TIDYFLAGS=-checks=-clang-analyzer-security.insecureAPI.strcpy,-clang-analyzer-optin.performance.Padding,-clang-analyzer-valist.Uninitialized,-clang-analyzer-core.NonNullParamChecker,-clang-analyzer-core.NullDereference -quiet
TIDY:=clang-tidy
tidy:
$(TIDY) $(CSOURCES) $(TIDYFLAGS) -- $(AM_CPPFLAGS) $(CPPFLAGS) -DHAVE_CONFIG_H
optiontable:
perl optiontable.pl < $(top_srcdir)/include/curl/curl.h > easyoptions.c
if HAVE_WINDRES
.rc.lo:
$(LIBTOOL) --tag=RC --mode=compile $(RC) -I$(top_srcdir)/include $(RCFLAGS) -i $< -o $@
endif