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  • Hash : 5865450d
    Author : Francisco Boni
    Date : 2021-03-23T19:50:09

    Update ax_cc_maxopt m4 macro (#617) Keeps libffi's specific changes (https://github.com/libffi/libffi/commit/cec3a3a201f17a7f018f25e1a0917bd5206e5a5a#diff-2396a1256ac4b1c6849c931ddb8018bdd984bb2383be21bb819a33b95d8d603f) and updates to the latest ax_cc_maxopt.m4 (http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=commit;h=73ee1b396c21062ee8eeb8721ba5323322110fb5): ax_cc_maxopt.m4: retain setting of CFLAGS by configure AX_CC_MAXOPT checks whether CFLAGS was set by the user; if so, the user’s setting is respected. This behavior is retained, of course. However, AX_CC_MAXOPT was then setting CFLAGS="". This overrode the default setting by configure, which usually includes -g. Hence, if CFLAGS was not set by the user, retain the default setting, to preserve the ability to debug. A typical default setting from configure is "-g -O2". This means that AX_CC_MAXOPT might typically set CFLAGS to "-g -O2 -O3". This is fine, because the later -O3 will override the earlier -O2. (The only assumption is that all compilers that AX_CC_MAXOPT knows behave in this sane way.)