Zack Weinberg c38538737c Revert "AC_PROG_CC: define via AC_DEFUN_ONCE". (#110350) ... Revert commit 18c140b50b, restoring AC_PROG_CC to being defined as an ordinary AC_DEFUN. This broke third-party macros (e.g. the Autoconf Macro Archive’s AX_PROG_CC_FOR_BUILD) that intentionally invoked AC_PROG_CC a second time with its guts redefined via a whole bunch of ‘pushdef’s. I don’t think we want to support this long-term, but needing access to a build-native compiler in cross-compilation is common enough that we should have *some* supported way to do it, and it may as well be AX_PROG_CC_FOR_BUILD until we come up with something better. If we go back to AC_DEFUN_ONCE for AC_PROG_CC in the future, we should do it consistently for all the “find me a compiler” macros -- it was *only* done for AC_PROG_CC in 18c140b5. The rationale for AC_DEFUN_ONCE seems to have been to reduce the size of the generated configure script. The bulk of the size accountable to AC_PROG_CC is the test programs for figuring out which version of the C standard is available, so I tweaked _AC_C_STD_TRY (and _AC_CXX_STD_TRY) to emit that text only once per program, into shell variables which can then be referenced repeatedly. Fixes bug #110350. * NEWS, doc/autoconf.texi: Revert documentation changes associated with AC_PROG_CC being a one-shot macro. * lib/autoconf/c.m4 (AC_PROG_CC): Revert to defining with AC_DEFUN. (_AC_C_STD_TRY, _AC_CXX_STD_TRY): Emit the test program only once, even if invoked multiple times with the same arguments. * tests/foreign.at (AX_PROG_CC_FOR_BUILD, AX_PROG_CXX_FOR_BUILD): New tests.		2020-12-04 16:41:43 -05:00
..
autoconf.texi	Revert "AC_PROG_CC: define via AC_DEFUN_ONCE". (#110350)	2020-12-04 16:41:43 -05:00
fdl.texi	make fetch	2020-09-03 12:08:31 -04:00
gendocs_template	make fetch	2020-06-29 17:08:26 -07:00
gnu-oids.texi	make fetch	2020-07-11 11:10:39 -04:00
install.texi	maint: make update-copyright	2020-01-01 11:45:50 -08:00
local.mk	maint: make update-copyright	2020-01-01 11:45:50 -08:00
make-stds.texi	make fetch	2020-06-29 17:08:26 -07:00
standards.texi	make fetch and update savannah gitweb urls to cgit.	2020-11-30 11:45:24 -05:00