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configure: work around a bug in AX_PROG_CC_FOR_BUILD... 

... when building on Windows.
From bug 780270, comment 18:
I'm still having issue with Windows MinGW, but I have traced the issue
with the autoconf itself, and the autoconf-archive script
"ax_prog_cc_for_build.m4". I have written to the autoconf-archive
mailing list.

It seem that this script never worked as intended since a long time
because the way it works, it pushdef a few elements, then it disable
cross-compiling (for the following test), and invoke AC_PROG_CC (which
in turn invoke the code that find and set the exe extention). Then it
grab the BUILD_EXEEXT from that. This is neat and simple, but the issue
is that the autoconf AC_PROG_CC macro only invoke the code that is
responsible for finding the exe (and obj) extensions once (with
m4_expand_once). So, the end-result is that in the resulting configure
script, EXEEXT is properly evaluated, but when comes the time to
evaluate BUILD_EXEEXT, no test is performed to actually find the exe
(and obj) extension, even if the cross-compilation option changed (which
is the case for the duration of this test).

So, BUILD_EXEEXT will always end up blank (defined, but blank).
This commit is contained in:
Éric Hoffman 2017-03-29 14:30:36 +02:00 committed by Jehan
parent b8a04c5a08
commit dddcdb42c6
1 changed files with 5 additions and 0 deletions
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5
configure.ac
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@ -233,6 +233,11 @@ AS_IF([test "x$0" != "x./configure"], [
# Determine a C compiler to use # Determine a C compiler to use
AC_PROG_CC AC_PROG_CC
AX_PROG_CC_FOR_BUILD AX_PROG_CC_FOR_BUILD
# Works around a bug in AX_PROG_CC_FOR_BUILD for build with MinGW on
# Windows. See bug 780270, comment 18.
case "$build_os" in
cygwin*|mingw32*|mingw64*) BUILD_EXEEXT=.exe ;;
esac
AM_PROG_CC_C_O AM_PROG_CC_C_O
# Determine a C++ compiler to use # Determine a C++ compiler to use