Peter Wang 55fe525123 Check for gcc generating PIC by default. ...

In configure, we try detect the non-working combination of gcc 5+,
targeting x86, PIC, and non-local gotos. We assumed that PIC is only
generated when creating shared libraries, but gcc may have been
configured to generate PIC by default. This is very common on more
recent Linux distributions.

configure.ac:
    Extend the test mentioned above: if shared libraries are disabled,
    check whether gcc generates PIC anyway.

    Clean up the code a little.

m4/mercury.m4:
    Add helper macros MERCURY_CC_TARGETS_X86 and
    MERCURY_CC_GENERATES_PIC.

README.x86:
    Update this document.

2022-02-27 16:14:10 +11:00

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mercury.m4

Check for gcc generating PIC by default.

2022-02-27 16:14:10 +11:00

pkg.m4

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