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25991da0dc
save and restore CFLAGS by using shell syntax
Fixes: 69fee45923
Closes: https://bugs.gentoo.org/948358
Signed-off-by: Z. Liu <zhixu.liu@gmail.com>
Closes: https://github.com/gentoo/gentoo/pull/40196
Signed-off-by: Sam James <sam@gentoo.org>
38 lines
1.1 KiB
Diff
38 lines
1.1 KiB
Diff
https://bugs.gentoo.org/938689
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mbuffer use macro LIBC_(OPEN|READ|WRITE|FSTAT) whic are determined by
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'objdump -T ... | awk ...', but in the case of clag (at least for now),
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depend on the optimization levels, open|read will be optimized to other
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methods which cause LIBC_(OPEN|READ) become "", then error bellow:
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expected identifier or '('
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55 | int LIBC_OPEN(const char *path, int oflag, ...)
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I don't know the reason to find the name of open|read|write|fstat by this
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test, so use -O0 for the feature test code.
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Upstream Replied:
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> this concept is needed for the tapedrive emulator that replicates the
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> behavior of specific devices.
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diff --git a/configure.in b/configure.in
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index 95d6772..081625a 100644
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--- a/configure.in
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+++ b/configure.in
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@@ -155,6 +155,8 @@ AC_LANG(C)
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if test -z "$OBJDUMP"; then
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AC_MSG_WARN([unable to find objdump, which is needed to run tests])
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else
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+ old_CFLAGS="${CFLAGS}"
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+ CFLAGS="-O0"
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AC_MSG_CHECKING([linking open() and write() to detect libc names])
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AC_LINK_IFELSE([
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AC_LANG_SOURCE([[
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@@ -191,6 +193,7 @@ else
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],
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[AC_MSG_FAILURE([failed to link open/write test])]
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)
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+ CFLAGS="${old_CFLAGS}"
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fi
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