configure: document 'compiler_num' for gcc

The CURL_CHECK_COMPILER_GNU_C function sets the number to MAJOR*100 +
MINOR and ignores the patch version, and since gcc version 7 it only
sets it to MAJOR*100.

Reported-by: Stepan Efremov
Ref: #5067
Closes #5069
This commit is contained in:
Daniel Stenberg 2020-03-10 14:37:43 +01:00
parent b81e0b0778
commit f0f3952f55
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@ -5,7 +5,7 @@
# | (__| |_| | _ <| |___
# \___|\___/|_| \_\_____|
#
# Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
# Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
@ -151,8 +151,17 @@ AC_DEFUN([CURL_CHECK_COMPILER_DEC_C], [
dnl CURL_CHECK_COMPILER_GNU_C
dnl -------------------------------------------------
dnl Verify if compiler being used is GNU C.
dnl Verify if compiler being used is GNU C
dnl
dnl $compiler_num will be set to MAJOR * 100 + MINOR for gcc less than version
dnl 7 and just $MAJOR * 100 for gcc version 7 and later.
dnl
dnl Examples:
dnl Version 1.2.3 => 102
dnl Version 2.95 => 295
dnl Version 4.7 => 407
dnl Version 9.2.1 => 900
dnl
AC_DEFUN([CURL_CHECK_COMPILER_GNU_C], [
AC_REQUIRE([CURL_CHECK_COMPILER_INTEL_C])dnl
AC_REQUIRE([CURL_CHECK_COMPILER_CLANG])dnl