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restructure *CFLAGS configuration.

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Convert CFLAGS to be a concatenation:

  CFLAGS := CONFIGURE_CFLAGS SPECIFIED_CFLAGS EXTRA_CFLAGS

This ordering makes it possible to override the flags set by the
configure script both during and after configuration, with CFLAGS and
EXTRA_CFLAGS, respectively.

This resolves #619.
This commit is contained in:
Jason Evans
2016-12-16 07:18:55 -08:00
parent 7b53fe928e
commit 766ddcd0f2
3 changed files with 141 additions and 111 deletions
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17
INSTALL
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@@ -306,17 +306,16 @@ The following environment variables (not a definitive list) impact configure's
behavior:
CFLAGS="?"
Pass these flags to the compiler. You probably shouldn't define this unless
you know what you are doing. (Use EXTRA_CFLAGS instead.)
Pass these flags to the C compiler. Any flags set by the configure script
are prepended, which means explicitly set flags generally take precedence.
Take care when specifying flags such as -Werror, because configure tests may
be affected in undesirable ways.
EXTRA_CFLAGS="?"
Append these flags to CFLAGS. This makes it possible to add flags such as
-Werror, while allowing the configure script to determine what other flags
are appropriate for the specified configuration.
The configure script specifically checks whether an optimization flag (-O*)
is specified in EXTRA_CFLAGS, and refrains from specifying an optimization
level if it finds that one has already been specified.
Append these flags to CFLAGS, without passing them to the compiler during
configuration. This makes it possible to add flags such as -Werror, while
allowing the configure script to determine what other flags are appropriate
for the specified configuration.
CPPFLAGS="?"
Pass these flags to the C preprocessor. Note that CFLAGS is not passed to